Python for syntax conversion

[Gribouillis]

(a) I am ten years old
I love eating apple
I am a boy

(b) Apple is my favourite fruit
I am a male
I have birthed 10 years

Here is a basic algorithmic scheme that you could follow for such a work

Output:
Description of the input language: it has 3 statements

    age_stm:
        syntax: "I am <number> years old"
        parameters:
            number: a number written in english

    eating_stm:
        syntax: "I love eating <food>"
        parameters:
            food: the name of some food

    gender_stm:
        syntax: "I am a <gender>"
        parameters:
            gender: boy or girl

First step: PARSING OF THE INPUT FILE

    The aim of this step is to recognize the statements contained
    in the input file and their parameters. In the example, the result is
    a sequence of python objects

    age_stm(number = ten)
    eating_stm(food = apple)
    gender_stm(gender = boy)

Second step: CODE GENERATION

    each parsed statement is translated in a statement of the second
    language according to a specific rule

    rule for an age_stm:
        convert the number in english to a number in digits
        emit the statement "I have birthed <digits> years"

    rule for a eating_stm:
        identify the type of the food (eg apple is a fruit)
        emit the statement "<food> is my favorite <food type>"

    rule for a gender_stm:
        convert the gender to the appropriate transcription (boy -> male)
        emit the statement "I am a <converted gender>"

There may be many more rules, for example there may be rules to change the
order of the emited statements, also a single input statement may induce
more than one output statement, etc.